I'd love to see this back patched into 8.2.1 if possible.

Should I resubmit with new names?


Bruce Momjian wrote:
Is this something we want in 8.3?  I am thinking visible/expired would
be clearer terms.


Glen Parker wrote:
This patch consists of two c functions to expose n_live_tuples and
n_dead_tuples, SQL functions to expose them to SQL land, and corresponding fields added to pg_stat_all_tables.

This has been discussed in general. The purpose is to allow autovacuum-esq conditional vacuuming and clustering using SQL to discover the required stats.

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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